# Questions on Algebra: Matrices, determinant, Cramer rule answered by real tutors!

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 Algebra: Matrices, determinant, Cramer rule Solvers Lessons Answers archive Quiz In Depth

## Tutors Answer Your Questions about Matrices-and-determiminant (FREE)

 Question 109062: A bald eagle snatches a fish from a lake and flies to an altitude of 256 ft. The fish manages to squirm free and falls back down into the lake. Its height h in feet can be modeled by h(t)= 256-16 t squared, where t is the time in seconds. How many seconds will the fish fall before hitting the water? Click here to see answer by stanbon(57203)

 Question 109061: 26. Find the zeros of each function by factoring. h(x)=2x squared -12x + 18 Click here to see answer by stanbon(57203)

 Question 109060: Find the zeros of each function by factoring. 22. g(x)=2xsquared + x-10 Click here to see answer by scott8148(6628)

 Question 109138: Click here to see answer by anne(47)

 Question 109378: find the denominator for the x variable when using cramer's rule to solve x-3y=8 and 2x+2y=8. thanks Click here to see answer by stanbon(57203)

 Question 109380: True or False: it is possible to add a 3*3 matrix to a 3*5 matrix? thanks Click here to see answer by jim_thompson5910(28476)

 Question 109369: true or false: it is not possible to multiply a 3*4 matrix with a 4*3 matrix. thanks! Click here to see answer by jim_thompson5910(28476)

 Question 109394: A= [2 -1] B= [4 -2] [3 0] [5 1] Find 3A-B. Click here to see answer by jim_thompson5910(28476)

 Question 109445: hi, i really need help with this. find the numerator for the y variable when using cramer's rule to solve x-3y=8 and 2x+2y=8. thanks a bunch!! Click here to see answer by jim_thompson5910(28476)

 Question 109450: hi, true or false: you can multiply a 2*2 matrix by any matrix? true or false? thank you!! Click here to see answer by jim_thompson5910(28476)

 Question 109368: Solve this system using Cramer's rule x-3y=8 and 2x+2y=8. Thanks! Click here to see answer by bucky(2189)

 Question 110043: How do I write systems of equations in matrix form? Click here to see answer by Edwin McCravy(8879)
 Question 110043: How do I write systems of equations in matrix form? Click here to see answer by BrittanyM(80)

 Question 110060: ther's this theory of fermat which i don't understand something about it x(exp n)+y(exp n)=z(exp n)....was the aim out of it is to find constant numbers x.y.z so that the equation is true no matter what n from N.... and if that's true.did ernest commer prove it exept for some numbers and then it was proved totaly by andrew wiles Click here to see answer by stanbon(57203)

 Question 110217: How do I find determinant of a 3 by 3 matrix, using a graphing calculator, or the long way, either way is good for me. Click here to see answer by scott8148(6628)

 Question 110418: Given the following function: 4x2 – 3xy a) take the partial derivative with respect to x. b) take the partial derivative with respect to y. Click here to see answer by jim_thompson5910(28476)

 Question 110417: Find the derivative of the function with respect to x: Square root of 2-3x^2 Click here to see answer by jim_thompson5910(28476)

 Question 110838: How do you find the inverse of a 3 x 3 matrix Click here to see answer by jim_thompson5910(28476)

 Question 111079: how we can easly find Eigenvalues and Eigenvectors? Click here to see answer by jim_thompson5910(28476)

 Question 111583: The problem is- Solve the system by using matrix elimination: 3a-2b=5 2a+7b=9 I know that its suppose to end up looking like this: 1 0 a 0 1 b but I dont know how to solve this because of the 3a and the 2a. Click here to see answer by jim_thompson5910(28476)

 Question 111585: Janet can wax her car in 8 hours. When she works together with Darlene, they can wax the car in 30 minutes. How long would it take Darlene, working by herself, to wax the car? Is it the same as this: If J=8 and D+J= 1/2 D is equal to what? I know the answer 8/15 hours i dont know how it is got I dont know what topic is it? Thank You very much Click here to see answer by josmiceli(9645)

 Question 111688: find the value of k so that the system of the equation x+y+3z=0 4x+3y+kz=0 2x+y+2z=0 has no a non trival solution Click here to see answer by Edwin McCravy(8879)

 Question 111687: find the value of "a" and "b" so that the system of the of equation 2x+3y+5z=9 7x+3y-2z=8 2x+3y+az=b has 1)no solution 2)a unique solution 3)an infinite number of solution Click here to see answer by stanbon(57203)

 Question 111694: find the minors and cofactors of all the elements in the following matrix and hence, write down the cofactor matrix of A Click here to see answer by Edwin McCravy(8879)

 Question 111765: how are matrices like cryptology? Click here to see answer by elima(1433)

 Question 112377: Triangle ABC with vertices A(2,3), B(0,4), C(-3,-3) is Translated 3 units right and 1 unit down. Write Translation matrix. Find corrdinates. How do you solve this? Thanks. Click here to see answer by checkley71(8403)

 Question 112443: I had a word problem on a test involving Matrices, determinants and Cramer's Rule. I looked through all of my notes, and did not see anything on word problems and the text book was very vague. My professor created the test himself. We were to use a system to solve this word problem: A boat on a river travels downstream between two points, 20 miles apart, in one hour. The return trip against the current takes 2.5 hours. What is the speed of the current of the river? My Answer: x - 20y = 1 x + 20y = 2.5 Using elimination of the y-term 2x = 3.5 x = 3.5/2 Click here to see answer by Fombitz(13828)
 Question 112443: I had a word problem on a test involving Matrices, determinants and Cramer's Rule. I looked through all of my notes, and did not see anything on word problems and the text book was very vague. My professor created the test himself. We were to use a system to solve this word problem: A boat on a river travels downstream between two points, 20 miles apart, in one hour. The return trip against the current takes 2.5 hours. What is the speed of the current of the river? My Answer: x - 20y = 1 x + 20y = 2.5 Using elimination of the y-term 2x = 3.5 x = 3.5/2 Click here to see answer by bucky(2189)

 Question 112811: solve the system by substitution. Having trouble wrapping my brain around these-looked easy at first! 4x+3y=-13 -x+ y=5 Click here to see answer by checkley71(8403)

 Question 113455: can someone help me? solve the system: { x+5y-z=4 {3x+4y+z=4 { x- y+z=0 I do not understand these questions. thanks for the help. Click here to see answer by josmiceli(9645)

 Question 114409: y=0.00143x^4+0.0016x^3-0.236x^2+1.53x+0.739 How do you fine tune this equation on a graphing calculator Click here to see answer by jim_thompson5910(28476)

 Question 114419: y=0.00143x^4+0.00166x^3-0.236x^2+1.3x+0.739. Use a graphing calculator to fine tune this equation. where do you start and what am i supposed to do? I am a middle school algebra teacher trying to update my math skills. It has been awhile since I worked with algebra 2.hope someone can help me. thanks Click here to see answer by stanbon(57203)

 Question 114564: I just need to solve the matrix-I do know the answer, however, I'm not sure of how to do the problem. 3x+4y=13 2x-3y=-14 the answer is (-1,4) Please help! Click here to see answer by Fombitz(13828)

 Question 114759: Could you please help me out on this one? Ron ateends a party. He wants to limit his food intake to 103g protein, 93g fat, and 135g carbohydrate. The mushroom caps at the party have 3g protein, 5g fat, and 9g carbs, the meatballs have 14g protein, 7g fat, and 15g carbs, and the deviled eggs have 13g protein, 15g fat, and 6g carbs.How many of each snack can he eat to obtain his goal? Click here to see answer by stanbon(57203)

 Question 114937: f(x)= 7x + 5 / 2 - 3x find vertical and horizontal asymptots and given equation. I think the Ha. is 7/3?????????? Click here to see answer by jim_thompson5910(28476)

 Question 110416: Solve the simultaneous linear equations using determinants. 2x – 3y = 5 3x + 7y = -2 Click here to see answer by Nihat Routsong(11)

 Question 116336: I need help with these two matrice problems- solving it by the Gaussian elimination method: problem 1.)2x + y - 3z =1 3x - y + 4z =6 x + 2y - z =9 Click here to see answer by Edwin McCravy(8879)

 Question 116354: cantrell associastes a real estate developer is planning to build a new apartment complex consisting of one -bedroom aunits and two -and three - bedroom townhouses. a total of 192 units are planned and the number of family units two and three bedroom townhouses will equal the number of one bedroom units. If the number of one bedroom units will be 3 times the number of three bedroom units find how many units of each type will be in the complex Click here to see answer by ankor@dixie-net.com(15622)

 Question 116495: This question is about augmented matrices. The question says: Set up and solve the following systems of equations using augmented matrices, 3x-2y=8 6x-4y=1 What are the X and Y values? Click here to see answer by Edwin McCravy(8879)

 Question 114878: I need a example of how to use the Cramer Rule step by step. Click here to see answer by solver91311(16868)

 Question 116768: Determine whether the matrix has an inverse. If an inverse exists, find it. -1 - 1 2 3 Click here to see answer by Fombitz(13828)

 Question 116994: I really didn't know where to submit this question but I have been working on it for sometime and I'm not even sure how to get 2 equations by eliminating a variable. Should you in every circumsatnce of solving linear systems, attempt to first eliminate the x variable? Please help! solve the linear system without using matrices or determinants 2x-2y+z=-7 3x+y+2z=-2 5x+3y-3z=-7 Click here to see answer by jim_thompson5910(28476)

 Question 117044: please help me with this question.I am having difficulty eliminating variables. solve the linear system without using matrices or determinants x+y+z=2 x-y+3z=12 2x+5y+2z=-2 Click here to see answer by ankor@dixie-net.com(15622)

 Question 117507: what are the steps when using a graphing calculator to solve systems using inverse matrices Click here to see answer by bucky(2189)

 Question 117671: how to solve systems of equations Click here to see answer by solver91311(16868)

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